The title became, quite fittingly Agent Oooh! for it's
European release.

Charles Hawtrey plays a character with his own first
name, the first of many to do so in the Carry Ons. This is a bit of a
comic tradition Laurel and Hardy, Tony Hancock and most notably most of the
cast of Carry On Camping.

Charles Hawtrey's character was to be called Charlie
Bond 001 and a half, but Bond producer Harry Saltzman found out and threatened
legal action, so he was renamed Charlie Bind OOO, pronounced Oo -
Oo - Ooohh!

Continuity

When Milchmann waits for the explosion in the lab he faces it with his
eyes wide open. He should have turned away and have his eyes tightly closed,
probably also covered them with hands or an arm.

Bluebottle looks clean and neat when he emerges from a filthy sewer - a
paradox. Then, when his contact Schnitzel falls into the same sewer, it
sounds as if he fall into liquid sewage.

Simpkins and Bind lure the doorman from the fun house. The former hits him
with a copper pot and the man collapses. As he does so, his fez fall off and
lands in the middle of the door opening. However, in the next shot from
inside the building, the fez is nowhere to be seen.

Mr Simpkins hands the formula to Leila in his railway compartment. The
train brakes hard which gives him the opportunity to
take formula and revolver from her. A few moments later he leaves the
compartment to the outside of the carriage. The outside shot indicates that
the train is moving - not stationary after braking - which can also be
inferred from the noise that can be heard when the wheels run over the
joints in the rails.